747-400 AMM 飞机维护手册 发动机 ENGINE 2(105)

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 4) Remove the engine before the 101st hour of operation.
 (d) If the No. 4 bearing compartment does not have coke, do the steps that follow: 1) ENGINES PRE-PW-SB 72-472; Remove the No. 4 bearing (oil) nozzle and No. 4 bearing transfer tube.
 2)  ENGINES POST-PW-SB 72-472; Remove the No. 4 bearing (oil) nozzle, the No. 4 bearing damper supply tube, the front No. 4 bearing transfer tube, and the packing transfer tube.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
3) Remove the No. 4 bearing oil scavenge (inner) tube. 4) Remove the No. 4 bearing (oil) pressure tube. 5) Remove the No. 4 bearing scavenge tube.
 S 012-028-N00
 (6)  
ENGINES PRE-PW-SB 72-472; Remove the No. 4 bearing (oil) nozzle and No. 4 bearing transfer tube as follows (Fig. 201):

 (a)  
Remove the bolts and keywashers that attach the No. 4 bearing transfer tube to the No. 4 bearing nozzle.

 (b)  
Remove the No. 4 bearing transfer tube.

 (c)  
Remove the bolts and keywashers that attach the No. 4 bearing nozzle to the exhaust case.

 (d)  
Remove the No. 4 bearing nozzle.

 S 012-029-N00
 (7)  
ENGINES POST-PW-SB 72-472; Remove the No. 4 bearing (oil) nozzle and the front No. 4 bearing nozzle as follows (Fig. 201):

 (a)  
Remove the bolts and key washer that attach the front No. 4 bearing nozzle to the No. 4 bearing support flange at the 12 o'clock position. 1) Discard the key washer.

 (b)  
Move the packing transfer tube into the elbow of the No. 4 bearing damper supply tube. 1) Remove the nozzle.

 (c)  
Remove the packing transfer tube from the damper supply tube. 1) Discard the two packings.

 (d)  
Remove the bolts and key washers that attach the No. 4 bearing damper supply tube to the No. 4 bearing oil nozzle. 1) Remove the tube.

 (e)  
Remove the bolts and key washers that attach the No. 4 bearing nozzle to the exhaust case. 1) Remove the nozzle.

 S 012-008-N00
 (8)  
Remove the No. 4 bearing oil scavenge (inner) tube as follows (Fig. 202, Sheet 1):

 (a)  
Remove the keywasher and bolt that attach the tube bracket to the No. 4 bearing housing inner diameter at the 6 o'clock position.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE  A 
TURBINE EXHAUST CASE (TEC)  SEE  C  F  SEE  D  SEE  B 
SEE  E  H 
BOLT  SEE  G 

KEY WASHER
GASKET
B
BOLT
A
KEY WASHER
NO. 4 BEARING OIL SCAVENGE (INNER) TUBE
L-A3518(0292)
No. 4 Bearing Oil Components - Removal and Installation
Figure 202 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A47113
NO. 4 BEARING
OIL PRESSURE
TUBE (UPPER)

NUT
THRUST
WIRE

NO. 4 BEARING
(OIL) PRESSURE TUBE

OUTER
SURFACE
OF TEC

PARTS SHOWN FROM A DIFFERENT ANGLE
C
NO. 4 BEARING
NO. 4 BEARING  PRESSURE TUBE
(OIL) PRESSURE TUBE  (FRONT) HEATSHIELD
WIRE
TWIST ENDS OF LOCKWIRE TOGETHER
ADAPTER
EXAMPLE OF LOCKWIRE  NO. 4 BEARING
PRESSURE TUBE

INSTALLATION ON HEATSHIELD
(REAR) HEATSHIELD
D
NO. 4 BEARING
TUBE GUIDE
BOLT
E L-A3820(0292)
No. 4 Bearing Oil Components - Removal and Installation Figure 202 (Sheet 2)
　
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